[php-fpm] Fix possible "index out of range" (#8461)

plugins/inputs/phpfpm/phpfpm.go

@@ -7,7 +7,6 @@ import (
 	"io"
 	"net/http"
 	"net/url"
-	"os"
 	"strconv"
 	"strings"
 	"sync"
@@ -301,25 +300,18 @@ func globUnixSocket(url string) ([]string, error) {
 	}
 	paths := glob.Match()
 	if len(paths) == 0 {
-		if _, err := os.Stat(paths[0]); err != nil {
-			if os.IsNotExist(err) {
-				return nil, fmt.Errorf("Socket doesn't exist  '%s': %s", pattern, err)
-			}
-			return nil, err
-		}
-		return nil, nil
+		return nil, fmt.Errorf("socket doesn't exist %q: %v", pattern, err)
 	}
 
-	addrs := make([]string, 0, len(paths))
-
+	addresses := make([]string, 0, len(paths))
 	for _, path := range paths {
 		if status != "" {
 			path = path + ":" + status
 		}
-		addrs = append(addrs, path)
+		addresses = append(addresses, path)
 	}
 
-	return addrs, nil
+	return addresses, nil
 }
 
 func unixSocketPaths(addr string) (string, string) {